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    <!-- 基本语法 
        export声明语句 
         export const age=18; 
         不能随意命名 
        
       导入导出时起别名：
         
         export {fu as func,className as Person,age}  from './module2.js'
       
        整体导入:会导入所有的输出，包括export default导出的
        import * as obj from './module.js'
        
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